Masonry VenTubes (Package of 12)
Ventubes are hollow cylinders constructed of 100%, 304 series stainless steel. Each tube is 1/2" in diameter and 4 1/2" in length. A wire screen is welded in the front of each tube to prevent insect intrusion. VenTubes provide cross ventilation in chimneys with large cavity areas surrounding the flue liner. The tubes help prevent water damage caused by condensation common to this type of chimney construction.